Drawing mechanism for textile machines



y 7 R. B. SOLANAS 2,798,259

DRAWING MECHANISM FOR TEXTILE MACHINES Filed Oct. 5, 195 3 2 Shets-Sheet 1 lyiuzmww- J y 1957 R. B. SOLANAS 2,798,259

DRAWING MECHANISM FOR TEXTILE MACHINES Filed Oct. 5, 1953 2 Sheets-Sheet 2 5a. 7 y We. 9

ab w 7M United States Patent Y 2,798,259 DRAWING MECHANISM FOR TEXTILE MACHINES Ramon Balmes Solanas, Santa Coloma de Cervello, Spain, assignor to Estirajes Balmes, S. A., Barcelona, Spain Application October 5, 1953, Serial No. 384,245 Claims priority, application Spain November 11, 1952 3 Claims. (Cl. 19-130) The present invention relates to drawing mechanisms for drawing textile rovings or' slivers, such as are used in spinning and preparing machines, in which the said roving or sliver of fibres passes between a series of pairs of rollers and sometimes through other members which accompany the fibres.

It is customary in such mechanisms in order to obtain a big draft to guide the fibres towards the final rollers using members which accompany and retain the fibres preventing them from loosening from the roving or slivers but which allow them to slide so that the drawing action can take place. It is an advantage in this respect to use a roller for conducting the roving or sliver, this roller resting freely on the bottom rollers of two consecutive pairs of rollers and being combined withv a device for reducing the width of the roving or slivers and located under the conducting roller which device reunites the fibres and imparts cohesion to them.

The invention relates to drawing mechanisms using a conducting roller of this type for the fibres and its object is to improve the working of this conducting roller and to facilitate the handling of the machine.

The invention consists essentially in the use of a small apparatus or device, resting on two consecutive bottom rollers, this device conducting and pressing the fibres and at the same time uniting these fibres or reducing the width of the roving. The device in'question consists of a rigid frame provided with a roller for conducting or pressing the fibres and having formed in the lower portion thereof a reducer for reducing the width of the roving or slivers, a handle being provided at the top of the frame for facilitating the operation of placing the device in and removing it from the machine. The said roller is mounted inside the frame in such a way that itvis able to rotate freely and projects beyond the edges of the frame both at the front and at the rear and it rests on the bottom rollers of the two adjacent pairs of rollers mentioned.

When the fibres enter the device in question they are first of all submitted to compression between the pressing roller and the first roller of the pair of machine rollers in the direction of movement of the roving, the fibres then continuing while still contacting the surface of the pressing roller over a certain distance thereof, the pressing roller guiding them, preventing by adherence the loose fibres from breaking away. The fibres then pass through the reducer and then continue moving for a certain distance while contacting the surface of the pressing roller and finally undergoing a second compression between the pressing roller and the lower roller of the next pair of machine rollers.

The device according to the invention provides a perfect guiding action and grouping of the fibres together so that a better drafting is obtained and the thread produced is stronger and more uniform.

It is an advantage if the pair of rollers which succeeds the device has top rollers of a small size for facilitating the sliding action of the fibres.

The pressing roller may be provided with a groove or 2,798,259 Patented July 9, 1957 throat into which the fibres are made to pass for improving the uniting effect. In a case of this kind, the condenser is provided with an open or slotted notch so as to lead the fibres towards the groove of the pressing roller.

The accompanying drawings show the necessary parts of the drawing mechanism of textile machines to which the invention is applied.

Fig. 1 shows diagrammatically and in section in the direction followed by'the roving or slivers the central partof a drawing mechanism consisting of several pairs of rollers provided with the pressing and uniting device.

Figure 2 is a vertical section of the apparatus showing a detail.

Figure 3 is a front view of the apparatus.

Figure 4 is a similar view of another embodiment of the invention, the pressing roller of which is grooved.

Figures 5 and 6 are a front and vertical sectional view respectively of another embodiment in which the pressing roller is grooved and the sliding roller is very narrow being introduced into the groove of the pressing roller.

Figure 7 is a similar view to that shown in Figure 1 of an embodiment in which the frame does not rest on the bottom rollers.

Figure 8 shows a detail modification of Figure 7.

Figure 9 is a front view of the frame and roller of this form of construction.

Figure 10 is a disassembled view showing how the frame in Figures 7 to 9 is formed.

The drawing mechanism shown in Figure l is provided with a number of intermediate rollers 1, 2 and 3, 4, the second pair 3, 4 of which is provided with a top roller 4 of small size arranged so as to allow the sliding of the fibres. The pressing uniting device of the invention is located between these two pairs of intermediate rollers, and as illustrated in the drawings, it compresses the fibres of the roving or slivers at two points against the two lower rollers 1, 3 of the adjacent pairs of rollers, effecting in addition between these two points a reduction of the roving or sliver or uniting of the fibres of same. The rollers 1, 2, 3 and 4 each have portions of the surface thereof which are roughened in order to grasp the roving and defining a drafting path. The roughened portions are not shown.

The roving or sliver 5 on penetrating into the drawing mechanism undergoes a first drawing or prior drafting and isthen gripped by the next pair of rollers 1, 2. It then passes to the next pair of rollers 3, 4 while being guided by the pressing roller 6, and from these to the final drawing rollers, the latter effecting the second drawing or final drafting of the roving. V

The pressing uniting device forming part of the present invention consists of a small frame 7 provided at its upper part with a handle 8 to enable the device to be handled easily and at its bottom part with a channel 9 which acts as a condenser for the roving or sliver or fibre uniting device.

Mounted in freely rotatable manner inside this frame is the pressing roller 6 which projects at both sides of the frame and which is shorter in the direction of its length than the width of the roughened portions on rollers 1, 2, 3 and 4. When this roller is in its working position it bears on the lower rollers 1, 3 of the two adjacent pairs of rollers, the roller having compressive action on the roving at these two points. Between these two compression points the roving follows the surface of roller 6 for a certain distance and then enters channel 9 forming the condenser for the fibres.

In the embodiment which is shown in Figures 1 to 3 the edges of the frame 7 rest on the lower rollers l and 3 and the pressing roller 6 is completely free inside the frame and also bears on the rollers 1 and 3. The pressing roller 6 is provided with small journals 10, these the lower journals resting when the device is not in the working position against angularly disposed ribs 11 provided on the inside faces of the frame. The position of these ribs 11 ispreferably such that, when the roller 6 is -in its working position, it simply bears against the lower. rollers 1, 3 so that its-journals are lifted. clear of the ribs in question. 7

The ribs 11 on the lateral faces of the frame are preferably arranged in such a position that theroller 6 cannot become detached from the frame by accident. For this purpose one of theends 12 of these ribs is so high up that it prevents the roller 6 from coming out of the frame, since the face of the roller encounters the top part 14 of the frame before this can take place. Thevother end-l3 is further down so that it allows the roller to be detached at this side but it is high enough up to make it necessary to exert a certain amount of force in order to free the roller, the ideaof this being to prevent this roller coming out of the frame by accident.

As shown in Figure 3, the lower part of the frame 7 has the shape of a channel '9, this part forming the part for uniting or condensing the fibres. channel is very wide *and is formed by the two bottom edges 15 and narrows rapidly until it forms a very narrow groove 16, the roving or sliver entering this groove and rubbing along the bottom 17 of it. Owing to the unusual width of the mouth or inlet part of this reducer no particular care is needed when placing the device on the drawing mechanism so that the .roving or sliver is easily embraced between the inlet edges 15 of the channel, the inclined planes formed by these edges conducting the roving or sliver to the groove or narrow part 16 where the uniting or condensation of the fibres is effected.

A modification of the device is illustrated in Figure 4, the'roller 18 being provided in this case with a groove 19, it being this groove which actually effects the uniting or condensation of the fibres. In this example, the channel 9 at the bottom of the frame isopen so that the roving passes through the opening 20 entering the roller groove 19. This method. enables the reducing action to be effected with less friction, owing to the fact that the lateral walls of the groove 19 follow the .motion of the roving.

It is possible in this case as illustrated in Figures and 6, to make use of a small sliding roller 21in combination with the roller 18, the central effective part 22. of the roller 21 fitting into the groove 19 of the roller 18.

In Figures .7 to embodiments of the frame and roller are shown which have been found to be particularly suitable in most cases. In this form of construction the roller 26 is not free but is united permanently with the frame 27 and is adapted soastobe able to rotate about cylindrical projecting parts 28,.provided on the inside faces of the frame. 27, these projecting parts engaging in bores 25 with which the roller is provided- 1 These cylindrical projections form the journals or pivots for the roller and they are made relatively large so as to render diflicult the accumulation offluff which.may enter between the frame and the roller. The projecting parts in question mayeven have an annular form as illustrated in Figures 8 and 9, that is to say, they may be:

provided with a central bore 24, thepurpose of which is for enabling fluffto be removed or loosened which may have entered the'hollow portions 25 between the frame and the roller.

The frame is preferably composed of. anumber of 1 parts or elements 29,- 30 and .31,as illustrated in Figure 10, these parts being assembledtogether by means of screw, the roller 26 being easy to assemble in the frame. With a construction of this sort, ittwould be a simple The mouth of this 4, matter to dismantle the frame for purposes of cleaning or for replacement of the roller.

In this form of construction the frame does not bear on the bottom rollers 1, 3, the device resting as a whole on these rollers 1, 3 solely through the rotary roller 26 so as to reduce the friction between the various parts. The frame 27 only touches the roller 3 at the projections 23 at the end of the lower reducing channel at which the fibres are delivered to the point of tangency between the rollers 3 and 26.1,. The ,lower part of the frame is preferably shaped so as to make this zone of contact as small as possible. 7

In all 'cases it is'an advantage to provide the pressing anduniting device; With 'a reciprocating motion in a transverse direction to .the direction of the roving. This can be carried out by diiferent'methods and particularly by the method already in use for certain types or roving reducers, namely by providing ,a bar under the rollers provided with a reciprocating motion which is synchronous, with the motion of the rear bar for guiding the roving.

I claim:

1. For use in a drawing mechanism for textile rovings having a series of pairs of rollers each pair having an upper and lower roller and each pair having at least one portion thereon defining a drafting path, that improvementcomprising a device for pressing and uniting the fibers of the-roving, said device comprising'a rigid frame adaptedto fit between the lower rollers of adjacent pairs, and a pressing roller rotatably mountedwithin said frame and adapted. to run on said lower rollers, a lower portion of said frame having a tapered channel therein, tapering from ;a width substantially equal to the length of said pressing roller toward said pressing roller, and an upper portion of said frame formed as a handle, said pressing roller being of substantially less width in the direction of the: length of said roller than the width of the drafting pathin the direction of the length of said pairs of rollers.

2. For use in a drawing mechanism for textile rovings and having aseries of pairs of rollers each pair having an upper and lower roller and each pair having at least one portion thereondefining a drafting path,-that improvement comprising a device for pressing and uniting the fibers of the roving, said device comprising'a rigid frame adapted to fit between the lower rollers of adjacent pairs,

said frame consisting of two side portions each having- .the width of the drafting path in the direction of the I 'length vof said pairs of rollers.

j 3. .A device asclairned in claim 2 in which said bottom part hastwo projections thereon on either side of the narrow end of the tapered channel in said bottom part.

References Cited in the file of this patent UNITED STATES PATENTS 2,205,701 Balmes Solanas June 25, 1940 FOREIGN PATENTS 321,806 Germany June 15, 1920 

